Drill



- March 1 1927.

` 1,619,209 O. LUscHNlG DRILL Filed Oct. l, 1924 ATTORNEY Patented Mar. 1, 1927.

UNITED STATES OSWALVD YQLUSCI-III'IG?, OF NOKOMIS, ILLINOIS.

DRILL. C

Application filed October 1, 1924. Serial No. 740,900.

This invention relates to drills such as are used in coal mines in drilling out sockets for expansible bolts.

For further comprehension of the invention, and of the objects ancl` advantages thereof, reference will be had to the following description and accompanying drawing, and to the appended claims in which the various novel features of the invention are more particularly set forth.

Fig. 1 of the drawing is a vertical sectional view through a gallery or pocket in a coal mine showing my improved drill at work therein.

Figs. 2 and 3 are side and edge views respectively of the drill bit. l

Fig. 41s a de tail perspective view of the drilling device, certain parts being broken away.

In the drawing the reference numeral 10 is used to indicate the Hoor of the coal pocket v or seam in which the socket is to be drilled.

My'improved socket drilling device comprises a base plate 11 having spurs or spikes such as 12 projected from the lower face thereof and adapted to engage in the floor of the coal seam. This plate has hinged to the upper side thereof, as indicated at 13, a U- shaped member 14:. One of the legs of this member is formed at its upper end with an eye 15 through which is passed the shank 34. of a rotary drilling member to be presently referred to, the said shank having a collar 16 ixcd thereon against which the eye 15 is adapted to bear, and is also provided with a crank handleJ on its rear end. The other leg of the member 14 is extended in the form of a foot lever 17, while the drill shank is formed with a crank handle 18. In the use of the drilling device the base-plate 11 is placed on the floor of the coal seam at a suitable point and the workman ,stands with one foot on said plate and the other pressing downward on the lever 17 and rotates the drill by means of the crank handle 18.

The improved drill bit that I prefer to use comprises a shank 35 of rectangular cross section that has a pair of transverse plates 36 on opposite sides thereof at its forward end. Between these plates, at opposite sides of the shank, are positioned the curved side bit-elements 37, the plates having `their inner or adjacent faces formed with grooves to receive these bit elements, these bit elements diverging slightly from the shank as shown. The end of the shank is chamfered as at 38 and it has mounted therein a central bit element 40 having a pair of oppositely projecting points L11. The parts are all secured to the shank by means of a bolt 42 having a nut 43 threaded thereon.

Having thus described my invention, what I claim as new and desire to protect by Letters Patent of the United States is as follows 1. A coal mining device comprising a base plate having hinged thereto a U-shaped member, one of the legs of this member being formed with an eye through which is passed the shank of a rotary drilling member, said shank having a collar liXed thereon against which the eye is adapted to bear, and also provided with a crank handle on its rear end, and the other leg of the U-shape member being extended in the form of a foot lever.

2. A coal mining device comprising a base plate having hinged thereto on the upper side thereof by means of a pair of bearings,

a U-shaped member, one of the legs of this` member being formed with an eye through which is passed the shank of a rotary drilling member, said shank having a collar fixed thereon against whichthe eye is adapted to bear, and also provided with a crank handle on its rear end, and the other leg of the U- shape member being extended in the form of a foot lever, whereby a workman may stand with one foot on the said base plate` and have the other foot pressing downward on the said foot lever, while rotating the drill by means of the crank handle.

In testimony whereof I have affixed my signature.

OSWALD LUSCI-INIG. 

